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    <section id='main' class="content"><pre class="line-numbers"><span id="1">   1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>;

<span class="kw">use</span> {<span class="ident">Expr</span>, <span class="ident">CharClass</span>, <span class="ident">ClassRange</span>, <span class="ident">ByteClass</span>, <span class="ident">ByteRange</span>, <span class="ident">Repeater</span>};

<span class="doccomment">/// A set of literal byte strings extracted from a regular expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Every member of the set is a `Lit`, which is represented by a `Vec&lt;u8&gt;`.</span>
<span class="doccomment">/// (Notably, it may contain invalid UTF-8.) Every member is said to be either</span>
<span class="doccomment">/// *complete* or *cut*. A complete literal means that it extends until the</span>
<span class="doccomment">/// beginning (or end) of the regular expression. In some circumstances, this</span>
<span class="doccomment">/// can be used to indicate a match in the regular expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that a key aspect of literal extraction is knowing when to stop. It is</span>
<span class="doccomment">/// not feasible to blindly extract all literals from a regular expression,</span>
<span class="doccomment">/// even if there are finitely many. For example, the regular expression</span>
<span class="doccomment">/// `[0-9]{10}` has `10^10` distinct literals. For this reason, literal</span>
<span class="doccomment">/// extraction is bounded to some low number by default using heuristics, but</span>
<span class="doccomment">/// the limits can be tweaked.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Literals</span> {
    <span class="ident">lits</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Lit</span><span class="op">&gt;</span>,
    <span class="ident">limit_size</span>: <span class="ident">usize</span>,
    <span class="ident">limit_class</span>: <span class="ident">usize</span>,
}

<span class="doccomment">/// A single member of a set of literals extracted from a regular expression.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type has `Deref` and `DerefMut` impls to `Vec&lt;u8&gt;` so that all slice</span>
<span class="doccomment">/// and `Vec` operations are available.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">Ord</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Lit</span> {
    <span class="ident">v</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>,
    <span class="ident">cut</span>: <span class="ident">bool</span>,
}

<span class="kw">impl</span> <span class="ident">Literals</span> {
    <span class="doccomment">/// Returns a new empty set of literals using default limits.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">empty</span>() <span class="op">-&gt;</span> <span class="ident">Literals</span> {
        <span class="ident">Literals</span> {
            <span class="ident">lits</span>: <span class="macro">vec</span><span class="macro">!</span>[],
            <span class="ident">limit_size</span>: <span class="number">250</span>,
            <span class="ident">limit_class</span>: <span class="number">10</span>,
        }
    }

    <span class="doccomment">/// Get the approximate size limit (in bytes) of this set.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">limit_size</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">limit_size</span>
    }

    <span class="doccomment">/// Set the approximate size limit (in bytes) of this set.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If extracting a literal would put the set over this limit, then</span>
    <span class="doccomment">/// extraction stops.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The new limits will only apply to additions to this set. Existing</span>
    <span class="doccomment">/// members remain unchanged, even if the set exceeds the new limit.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_limit_size</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span> {
        <span class="self">self</span>.<span class="ident">limit_size</span> <span class="op">=</span> <span class="ident">size</span>;
        <span class="self">self</span>
    }

    <span class="doccomment">/// Get the character class size limit for this set.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">limit_class</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">limit_class</span>
    }

    <span class="doccomment">/// Limits the size of character(or byte) classes considered.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// A value of `0` prevents all character classes from being considered.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This limit also applies to case insensitive literals, since each</span>
    <span class="doccomment">/// character in the case insensitive literal is converted to a class, and</span>
    <span class="doccomment">/// then case folded.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The new limits will only apply to additions to this set. Existing</span>
    <span class="doccomment">/// members remain unchanged, even if the set exceeds the new limit.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_limit_class</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span> {
        <span class="self">self</span>.<span class="ident">limit_class</span> <span class="op">=</span> <span class="ident">size</span>;
        <span class="self">self</span>
    }

    <span class="doccomment">/// Returns the set of literals as a slice. Its order is unspecified.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">literals</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">Lit</span>] {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">lits</span>
    }

    <span class="doccomment">/// Returns the length of the smallest literal.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Returns None is there are no literals in the set.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">min_len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">min</span> <span class="op">=</span> <span class="prelude-val">None</span>;
        <span class="kw">for</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">lits</span> {
            <span class="kw">match</span> <span class="ident">min</span> {
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="ident">min</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">lit</span>.<span class="ident">len</span>()),
                <span class="prelude-val">Some</span>(<span class="ident">m</span>) <span class="kw">if</span> <span class="ident">lit</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="ident">m</span> <span class="op">=&gt;</span> <span class="ident">min</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">lit</span>.<span class="ident">len</span>()),
                _ <span class="op">=&gt;</span> {}
            }
        }
        <span class="ident">min</span>
    }

    <span class="doccomment">/// Returns true if all members in this set are complete.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_complete</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="op">!</span><span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">is_empty</span>() <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">l</span><span class="op">|</span> <span class="op">!</span><span class="ident">l</span>.<span class="ident">is_cut</span>())
    }

    <span class="doccomment">/// Returns true if any member in this set is complete.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">any_complete</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">lit</span><span class="op">|</span> <span class="op">!</span><span class="ident">lit</span>.<span class="ident">is_cut</span>())
    }

    <span class="doccomment">/// Returns true if this set contains an empty literal.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">contains_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">lit</span><span class="op">|</span> <span class="ident">lit</span>.<span class="ident">is_empty</span>())
    }

    <span class="doccomment">/// Returns true if this set is empty or if all of its members is empty.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">is_empty</span>() <span class="op">||</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">lit</span><span class="op">|</span> <span class="ident">lit</span>.<span class="ident">is_empty</span>())
    }

    <span class="doccomment">/// Returns a new empty set of literals using this set&#39;s limits.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Literals</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">Literals</span>::<span class="ident">empty</span>();
        <span class="ident">lits</span>.<span class="ident">set_limit_size</span>(<span class="self">self</span>.<span class="ident">limit_size</span>)
            .<span class="ident">set_limit_class</span>(<span class="self">self</span>.<span class="ident">limit_class</span>);
        <span class="ident">lits</span>
    }

    <span class="doccomment">/// Returns the longest common prefix of all members in this set.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">longest_common_prefix</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">u8</span>] {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() {
            <span class="kw">return</span> <span class="kw-2">&amp;</span>[];
        }
        <span class="kw">let</span> <span class="ident">lit0</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">lits</span>[<span class="number">0</span>];
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">lit0</span>.<span class="ident">len</span>();
        <span class="kw">for</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">lits</span>[<span class="number">1</span>..] {
            <span class="ident">len</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(
                <span class="ident">len</span>,
                <span class="ident">lit</span>.<span class="ident">iter</span>()
                   .<span class="ident">zip</span>(<span class="ident">lit0</span>)
                   .<span class="ident">take_while</span>(<span class="op">|</span><span class="kw-2">&amp;</span>(<span class="ident">a</span>, <span class="ident">b</span>)<span class="op">|</span> <span class="ident">a</span> <span class="op">==</span> <span class="ident">b</span>)
                   .<span class="ident">count</span>());
        }
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">lits</span>[<span class="number">0</span>][..<span class="ident">len</span>]
    }

    <span class="doccomment">/// Returns the longest common suffix of all members in this set.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">longest_common_suffix</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">u8</span>] {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() {
            <span class="kw">return</span> <span class="kw-2">&amp;</span>[];
        }
        <span class="kw">let</span> <span class="ident">lit0</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">lits</span>[<span class="number">0</span>];
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">lit0</span>.<span class="ident">len</span>();
        <span class="kw">for</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">lits</span>[<span class="number">1</span>..] {
            <span class="ident">len</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(
                <span class="ident">len</span>,
                <span class="ident">lit</span>.<span class="ident">iter</span>()
                   .<span class="ident">rev</span>()
                   .<span class="ident">zip</span>(<span class="ident">lit0</span>.<span class="ident">iter</span>().<span class="ident">rev</span>())
                   .<span class="ident">take_while</span>(<span class="op">|</span><span class="kw-2">&amp;</span>(<span class="ident">a</span>, <span class="ident">b</span>)<span class="op">|</span> <span class="ident">a</span> <span class="op">==</span> <span class="ident">b</span>)
                   .<span class="ident">count</span>());
        }
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">lits</span>[<span class="number">0</span>][<span class="self">self</span>.<span class="ident">lits</span>[<span class="number">0</span>].<span class="ident">len</span>() <span class="op">-</span> <span class="ident">len</span>..]
    }

    <span class="doccomment">/// Returns a new set of literals with the given number of bytes trimmed</span>
    <span class="doccomment">/// from the suffix of each literal.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If any literal would be cut out completely by trimming, then None is</span>
    <span class="doccomment">/// returned.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Any duplicates that are created as a result of this transformation are</span>
    <span class="doccomment">/// removed.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">trim_suffix</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">num_bytes</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Literals</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">min_len</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">len</span><span class="op">|</span> <span class="ident">len</span> <span class="op">&lt;=</span> <span class="ident">num_bytes</span>).<span class="ident">unwrap_or</span>(<span class="bool-val">true</span>) {
            <span class="kw">return</span> <span class="prelude-val">None</span>;
        }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_empty</span>();
        <span class="kw">for</span> <span class="kw-2">mut</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>() {
            <span class="kw">let</span> <span class="ident">new_len</span> <span class="op">=</span> <span class="ident">lit</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">num_bytes</span>;
            <span class="ident">lit</span>.<span class="ident">truncate</span>(<span class="ident">new_len</span>);
            <span class="ident">lit</span>.<span class="ident">cut</span>();
            <span class="ident">new</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">lit</span>);
        }
        <span class="ident">new</span>.<span class="ident">lits</span>.<span class="ident">sort</span>();
        <span class="ident">new</span>.<span class="ident">lits</span>.<span class="ident">dedup</span>();
        <span class="prelude-val">Some</span>(<span class="ident">new</span>)
    }

    <span class="doccomment">/// Returns a new set of prefixes of this set of literals that are</span>
    <span class="doccomment">/// guaranteed to be unambiguous.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Any substring match with a member of the set is returned is guaranteed</span>
    <span class="doccomment">/// to never overlap with a substring match of another member of the set</span>
    <span class="doccomment">/// at the same starting position.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Given any two members of the returned set, neither is a substring of</span>
    <span class="doccomment">/// the other.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unambiguous_prefixes</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Literals</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">is_empty</span>() {
            <span class="kw">return</span> <span class="self">self</span>.<span class="ident">to_empty</span>();
        }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">old</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Lit</span><span class="op">&gt;</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_empty</span>();
    <span class="lifetime">&#39;OUTER</span>:
        <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">candidate</span>) <span class="op">=</span> <span class="ident">old</span>.<span class="ident">pop</span>() {
            <span class="kw">if</span> <span class="ident">candidate</span>.<span class="ident">is_empty</span>() {
                <span class="kw">continue</span>;
            }
            <span class="kw">if</span> <span class="ident">new</span>.<span class="ident">lits</span>.<span class="ident">is_empty</span>() {
                <span class="ident">new</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">candidate</span>);
                <span class="kw">continue</span>;
            }
            <span class="kw">for</span> <span class="ident">lit2</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">new</span>.<span class="ident">lits</span> {
                <span class="kw">if</span> <span class="ident">lit2</span>.<span class="ident">is_empty</span>() {
                    <span class="kw">continue</span>;
                }
                <span class="kw">if</span> <span class="kw-2">&amp;</span><span class="ident">candidate</span> <span class="op">==</span> <span class="ident">lit2</span> {
                    <span class="comment">// If the literal is already in the set, then we can</span>
                    <span class="comment">// just drop it. But make sure that cut literals are</span>
                    <span class="comment">// infectious!</span>
                    <span class="ident">candidate</span>.<span class="ident">cut</span> <span class="op">=</span> <span class="ident">candidate</span>.<span class="ident">cut</span> <span class="op">||</span> <span class="ident">lit2</span>.<span class="ident">cut</span>;
                    <span class="ident">lit2</span>.<span class="ident">cut</span> <span class="op">=</span> <span class="ident">candidate</span>.<span class="ident">cut</span>;
                    <span class="kw">continue</span> <span class="lifetime">&#39;OUTER</span>;
                }
                <span class="kw">if</span> <span class="ident">candidate</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="ident">lit2</span>.<span class="ident">len</span>() {
                    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=</span> <span class="ident">position</span>(<span class="kw-2">&amp;</span><span class="ident">candidate</span>, <span class="kw-2">&amp;</span><span class="ident">lit2</span>) {
                        <span class="ident">candidate</span>.<span class="ident">cut</span>();
                        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lit3</span> <span class="op">=</span> <span class="ident">lit2</span>.<span class="ident">clone</span>();
                        <span class="ident">lit3</span>.<span class="ident">truncate</span>(<span class="ident">i</span>);
                        <span class="ident">lit3</span>.<span class="ident">cut</span>();
                        <span class="ident">old</span>.<span class="ident">push</span>(<span class="ident">lit3</span>);
                        <span class="ident">lit2</span>.<span class="ident">clear</span>();
                    }
                } <span class="kw">else</span> {
                    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=</span> <span class="ident">position</span>(<span class="kw-2">&amp;</span><span class="ident">lit2</span>, <span class="kw-2">&amp;</span><span class="ident">candidate</span>) {
                        <span class="ident">lit2</span>.<span class="ident">cut</span>();
                        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new_candidate</span> <span class="op">=</span> <span class="ident">candidate</span>.<span class="ident">clone</span>();
                        <span class="ident">new_candidate</span>.<span class="ident">truncate</span>(<span class="ident">i</span>);
                        <span class="ident">new_candidate</span>.<span class="ident">cut</span>();
                        <span class="ident">old</span>.<span class="ident">push</span>(<span class="ident">new_candidate</span>);
                        <span class="ident">candidate</span>.<span class="ident">clear</span>();
                    }
                }
                <span class="comment">// Oops, the candidate is already represented in the set.</span>
                <span class="kw">if</span> <span class="ident">candidate</span>.<span class="ident">is_empty</span>() {
                    <span class="kw">continue</span> <span class="lifetime">&#39;OUTER</span>;
                }
            }
            <span class="ident">new</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">candidate</span>);
        }
        <span class="ident">new</span>.<span class="ident">lits</span>.<span class="ident">retain</span>(<span class="op">|</span><span class="ident">lit</span><span class="op">|</span> <span class="op">!</span><span class="ident">lit</span>.<span class="ident">is_empty</span>());
        <span class="ident">new</span>.<span class="ident">lits</span>.<span class="ident">sort</span>();
        <span class="ident">new</span>.<span class="ident">lits</span>.<span class="ident">dedup</span>();
        <span class="ident">new</span>
    }

    <span class="doccomment">/// Returns a new set of suffixes of this set of literals that are</span>
    <span class="doccomment">/// guaranteed to be unambiguous.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Any substring match with a member of the set is returned is guaranteed</span>
    <span class="doccomment">/// to never overlap with a substring match of another member of the set</span>
    <span class="doccomment">/// at the same ending position.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Given any two members of the returned set, neither is a substring of</span>
    <span class="doccomment">/// the other.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unambiguous_suffixes</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Literals</span> {
        <span class="comment">// This is a touch wasteful...</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">clone</span>();
        <span class="ident">lits</span>.<span class="ident">reverse</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">unamb</span> <span class="op">=</span> <span class="ident">lits</span>.<span class="ident">unambiguous_prefixes</span>();
        <span class="ident">unamb</span>.<span class="ident">reverse</span>();
        <span class="ident">unamb</span>
    }

    <span class="doccomment">/// Unions the prefixes from the given expression to this set.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If prefixes could not be added (for example, this set would exceed its</span>
    <span class="doccomment">/// size limits or the set of prefixes from `expr` includes the empty</span>
    <span class="doccomment">/// string), then false is returned.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Note that prefix literals extracted from `expr` are said to be complete</span>
    <span class="doccomment">/// if and only if the literal extends from the beginning of `expr` to the</span>
    <span class="doccomment">/// end of `expr`.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">union_prefixes</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">expr</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_empty</span>();
        <span class="ident">prefixes</span>(<span class="ident">expr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lits</span>);
        <span class="op">!</span><span class="ident">lits</span>.<span class="ident">is_empty</span>() <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">contains_empty</span>() <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">union</span>(<span class="ident">lits</span>)
    }

    <span class="doccomment">/// Unions the suffixes from the given expression to this set.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If suffixes could not be added (for example, this set would exceed its</span>
    <span class="doccomment">/// size limits or the set of suffixes from `expr` includes the empty</span>
    <span class="doccomment">/// string), then false is returned.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Note that prefix literals extracted from `expr` are said to be complete</span>
    <span class="doccomment">/// if and only if the literal extends from the end of `expr` to the</span>
    <span class="doccomment">/// beginning of `expr`.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">union_suffixes</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">expr</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_empty</span>();
        <span class="ident">suffixes</span>(<span class="ident">expr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lits</span>);
        <span class="ident">lits</span>.<span class="ident">reverse</span>();
        <span class="op">!</span><span class="ident">lits</span>.<span class="ident">is_empty</span>() <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">contains_empty</span>() <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">union</span>(<span class="ident">lits</span>)
    }

    <span class="doccomment">/// Unions this set with another set.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If the union would cause the set to exceed its limits, then the union</span>
    <span class="doccomment">/// is skipped and it returns false. Otherwise, if the union succeeds, it</span>
    <span class="doccomment">/// returns true.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">union</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">lits</span>: <span class="ident">Literals</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">num_bytes</span>() <span class="op">+</span> <span class="ident">lits</span>.<span class="ident">num_bytes</span>() <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">limit_size</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="kw">if</span> <span class="ident">lits</span>.<span class="ident">is_empty</span>() {
            <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">Lit</span>::<span class="ident">empty</span>());
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">extend</span>(<span class="ident">lits</span>.<span class="ident">lits</span>);
        }
        <span class="bool-val">true</span>
    }

    <span class="doccomment">/// Extends this set with another set.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The set of literals is extended via a cross product.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If a cross product would cause this set to exceed its limits, then the</span>
    <span class="doccomment">/// cross product is skipped and it returns false. Otherwise, if the cross</span>
    <span class="doccomment">/// product succeeds, it returns true.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cross_product</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="ident">Literals</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="ident">lits</span>.<span class="ident">is_empty</span>() {
            <span class="kw">return</span> <span class="bool-val">true</span>;
        }
        <span class="comment">// Check that we make sure we stay in our limits.</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">size_after</span>;
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() <span class="op">||</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">any_complete</span>() {
            <span class="ident">size_after</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_bytes</span>();
            <span class="kw">for</span> <span class="ident">lits_lit</span> <span class="kw">in</span> <span class="ident">lits</span>.<span class="ident">literals</span>() {
                <span class="ident">size_after</span> <span class="op">+=</span> <span class="ident">lits_lit</span>.<span class="ident">len</span>();
            }
        } <span class="kw">else</span> {
            <span class="ident">size_after</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">iter</span>().<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">accum</span>, <span class="ident">lit</span><span class="op">|</span> {
                <span class="ident">accum</span> <span class="op">+</span> <span class="kw">if</span> <span class="ident">lit</span>.<span class="ident">is_cut</span>() { <span class="ident">lit</span>.<span class="ident">len</span>() } <span class="kw">else</span> { <span class="number">0</span> }
            });
            <span class="kw">for</span> <span class="ident">lits_lit</span> <span class="kw">in</span> <span class="ident">lits</span>.<span class="ident">literals</span>() {
                <span class="kw">for</span> <span class="ident">self_lit</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">literals</span>() {
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">self_lit</span>.<span class="ident">is_cut</span>() {
                        <span class="ident">size_after</span> <span class="op">+=</span> <span class="ident">self_lit</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="ident">lits_lit</span>.<span class="ident">len</span>();
                    }
                }
            }
        }
        <span class="kw">if</span> <span class="ident">size_after</span> <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">limit_size</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">base</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">remove_complete</span>();
        <span class="kw">if</span> <span class="ident">base</span>.<span class="ident">is_empty</span>() {
            <span class="ident">base</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Lit</span>::<span class="ident">empty</span>()];
        }
        <span class="kw">for</span> <span class="ident">lits_lit</span> <span class="kw">in</span> <span class="ident">lits</span>.<span class="ident">literals</span>() {
            <span class="kw">for</span> <span class="kw-2">mut</span> <span class="ident">self_lit</span> <span class="kw">in</span> <span class="ident">base</span>.<span class="ident">clone</span>() {
                <span class="ident">self_lit</span>.<span class="ident">extend</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">lits_lit</span>);
                <span class="ident">self_lit</span>.<span class="ident">cut</span> <span class="op">=</span> <span class="ident">lits_lit</span>.<span class="ident">cut</span>;
                <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">self_lit</span>);
            }
        }
        <span class="bool-val">true</span>
    }

    <span class="doccomment">/// Extends each literal in this set with the bytes given.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If the set is empty, then the given literal is added to the set.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// If adding any number of bytes to all members of this set causes a limit</span>
    <span class="doccomment">/// to be exceeded, then no bytes are added and false is returned. If a</span>
    <span class="doccomment">/// prefix of `bytes` can be fit into this set, then it is used and all</span>
    <span class="doccomment">/// resulting literals are cut.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cross_add</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bytes</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="comment">// N.B. This could be implemented by simply calling cross_product with</span>
        <span class="comment">// a literal set containing just `bytes`, but we can be smarter about</span>
        <span class="comment">// taking shorter prefixes of `bytes` if they&#39;ll fit.</span>
        <span class="kw">if</span> <span class="ident">bytes</span>.<span class="ident">is_empty</span>() {
            <span class="kw">return</span> <span class="bool-val">true</span>;
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">is_empty</span>() {
            <span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">limit_size</span>, <span class="ident">bytes</span>.<span class="ident">len</span>());
            <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">Lit</span>::<span class="ident">new</span>(<span class="ident">bytes</span>[..<span class="ident">i</span>].<span class="ident">to_owned</span>()));
            <span class="self">self</span>.<span class="ident">lits</span>[<span class="number">0</span>].<span class="ident">cut</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">&lt;</span> <span class="ident">bytes</span>.<span class="ident">len</span>();
            <span class="kw">return</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">lits</span>[<span class="number">0</span>].<span class="ident">is_cut</span>();
        }
        <span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_bytes</span>();
        <span class="kw">if</span> <span class="ident">size</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">len</span>() <span class="op">&gt;=</span> <span class="self">self</span>.<span class="ident">limit_size</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">1</span>;
        <span class="kw">while</span> <span class="ident">size</span> <span class="op">+</span> (<span class="ident">i</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">len</span>()) <span class="op">&lt;=</span> <span class="self">self</span>.<span class="ident">limit_size</span>
            <span class="op">&amp;&amp;</span> <span class="ident">i</span> <span class="op">&lt;</span> <span class="ident">bytes</span>.<span class="ident">len</span>() {
            <span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
        }
        <span class="kw">for</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">lits</span> {
            <span class="kw">if</span> <span class="op">!</span><span class="ident">lit</span>.<span class="ident">is_cut</span>() {
                <span class="ident">lit</span>.<span class="ident">extend</span>(<span class="kw-2">&amp;</span><span class="ident">bytes</span>[..<span class="ident">i</span>]);
                <span class="kw">if</span> <span class="ident">i</span> <span class="op">&lt;</span> <span class="ident">bytes</span>.<span class="ident">len</span>() {
                    <span class="ident">lit</span>.<span class="ident">cut</span>();
                }
            }
        }
        <span class="bool-val">true</span>
    }

    <span class="doccomment">/// Adds the given literal to this set.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Returns false if adding this literal would cause the class to be too</span>
    <span class="doccomment">/// big.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">lit</span>: <span class="ident">Lit</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">num_bytes</span>() <span class="op">+</span> <span class="ident">lit</span>.<span class="ident">len</span>() <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">limit_size</span> {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">lit</span>);
        <span class="bool-val">true</span>
    }

    <span class="doccomment">/// Extends each literal in this set with the character class given.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Returns false if the character class was too big to add.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add_char_class</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cls</span>: <span class="kw-2">&amp;</span><span class="ident">CharClass</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">_add_char_class</span>(<span class="ident">cls</span>, <span class="bool-val">false</span>)
    }

    <span class="doccomment">/// Extends each literal in this set with the character class given,</span>
    <span class="doccomment">/// writing the bytes of each character in reverse.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Returns false if the character class was too big to add.</span>
    <span class="kw">fn</span> <span class="ident">add_char_class_reverse</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cls</span>: <span class="kw-2">&amp;</span><span class="ident">CharClass</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">_add_char_class</span>(<span class="ident">cls</span>, <span class="bool-val">true</span>)
    }

    <span class="kw">fn</span> <span class="ident">_add_char_class</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cls</span>: <span class="kw-2">&amp;</span><span class="ident">CharClass</span>, <span class="ident">reverse</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">char</span>;

        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">class_exceeds_limits</span>(<span class="ident">cls</span>.<span class="ident">num_chars</span>()) {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">base</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">remove_complete</span>();
        <span class="kw">if</span> <span class="ident">base</span>.<span class="ident">is_empty</span>() {
            <span class="ident">base</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Lit</span>::<span class="ident">empty</span>()];
        }
        <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="ident">cls</span> {
            <span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">e</span>) <span class="op">=</span> (<span class="ident">r</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">u32</span>, <span class="ident">r</span>.<span class="ident">end</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">+</span> <span class="number">1</span>);
            <span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> (<span class="ident">s</span>..<span class="ident">e</span>).<span class="ident">filter_map</span>(<span class="ident">char</span>::<span class="ident">from_u32</span>) {
                <span class="kw">for</span> <span class="kw-2">mut</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="ident">base</span>.<span class="ident">clone</span>() {
                    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">to_string</span>().<span class="ident">into_bytes</span>();
                    <span class="kw">if</span> <span class="ident">reverse</span> {
                        <span class="ident">bytes</span>.<span class="ident">reverse</span>();
                    }
                    <span class="ident">lit</span>.<span class="ident">extend</span>(<span class="kw-2">&amp;</span><span class="ident">bytes</span>);
                    <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">lit</span>);
                }
            }
        }
        <span class="bool-val">true</span>
    }

    <span class="doccomment">/// Extends each literal in this set with the byte class given.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Returns false if the byte class was too big to add.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add_byte_class</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cls</span>: <span class="kw-2">&amp;</span><span class="ident">ByteClass</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">class_exceeds_limits</span>(<span class="ident">cls</span>.<span class="ident">num_bytes</span>()) {
            <span class="kw">return</span> <span class="bool-val">false</span>;
        }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">base</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">remove_complete</span>();
        <span class="kw">if</span> <span class="ident">base</span>.<span class="ident">is_empty</span>() {
            <span class="ident">base</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Lit</span>::<span class="ident">empty</span>()];
        }
        <span class="kw">for</span> <span class="ident">r</span> <span class="kw">in</span> <span class="ident">cls</span> {
            <span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">e</span>) <span class="op">=</span> (<span class="ident">r</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">u32</span>, <span class="ident">r</span>.<span class="ident">end</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">+</span> <span class="number">1</span>);
            <span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> (<span class="ident">s</span>..<span class="ident">e</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="kw">as</span> <span class="ident">u8</span>) {
                <span class="kw">for</span> <span class="kw-2">mut</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="ident">base</span>.<span class="ident">clone</span>() {
                    <span class="ident">lit</span>.<span class="ident">push</span>(<span class="ident">b</span>);
                    <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">lit</span>);
                }
            }
        }
        <span class="bool-val">true</span>
    }

    <span class="doccomment">/// Cuts every member of this set. When a member is cut, it can never</span>
    <span class="doccomment">/// be extended.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="kw">for</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">lits</span> {
            <span class="ident">lit</span>.<span class="ident">cut</span>();
        }
    }

    <span class="doccomment">/// Reverses all members in place.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reverse</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="kw">for</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">lits</span> {
            <span class="ident">lit</span>.<span class="ident">reverse</span>();
        }
    }

    <span class="doccomment">/// Clears this set of all members.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">clear</span>();
    }

    <span class="doccomment">/// Pops all complete literals out of this set.</span>
    <span class="kw">fn</span> <span class="ident">remove_complete</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Lit</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">base</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
        <span class="kw">for</span> <span class="ident">lit</span> <span class="kw">in</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">lits</span>, <span class="macro">vec</span><span class="macro">!</span>[]) {
            <span class="kw">if</span> <span class="ident">lit</span>.<span class="ident">is_cut</span>() {
                <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">push</span>(<span class="ident">lit</span>);
            } <span class="kw">else</span> {
                <span class="ident">base</span>.<span class="ident">push</span>(<span class="ident">lit</span>);
            }
        }
        <span class="ident">base</span>
    }

    <span class="doccomment">/// Returns the total number of bytes in this set.</span>
    <span class="kw">fn</span> <span class="ident">num_bytes</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">iter</span>().<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">accum</span>, <span class="ident">lit</span><span class="op">|</span> <span class="ident">accum</span> <span class="op">+</span> <span class="ident">lit</span>.<span class="ident">len</span>())
    }

    <span class="doccomment">/// Returns true if a character class with the given size would cause this</span>
    <span class="doccomment">/// set to exceed its limits.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The size given should correspond to the number of items in the class.</span>
    <span class="kw">fn</span> <span class="ident">class_exceeds_limits</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="ident">size</span> <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">limit_class</span> {
            <span class="kw">return</span> <span class="bool-val">true</span>;
        }
        <span class="comment">// This is an approximation since codepoints in a char class can encode</span>
        <span class="comment">// to 1-4 bytes.</span>
        <span class="kw">let</span> <span class="ident">new_byte_count</span> <span class="op">=</span>
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">lits</span>.<span class="ident">is_empty</span>() {
                <span class="ident">size</span>
            } <span class="kw">else</span> {
                <span class="self">self</span>.<span class="ident">lits</span>
                    .<span class="ident">iter</span>()
                    .<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">accum</span>, <span class="ident">lit</span><span class="op">|</span> {
                        <span class="ident">accum</span> <span class="op">+</span> <span class="kw">if</span> <span class="ident">lit</span>.<span class="ident">is_cut</span>() {
                            <span class="comment">// If the literal is cut, then we&#39;ll never add</span>
                            <span class="comment">// anything to it, so don&#39;t count it.</span>
                            <span class="number">0</span>
                        } <span class="kw">else</span> {
                            (<span class="ident">lit</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>) <span class="op">*</span> <span class="ident">size</span>
                        }
                    })
            };
        <span class="ident">new_byte_count</span> <span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">limit_size</span>
    }
}

<span class="kw">fn</span> <span class="ident">prefixes</span>(<span class="ident">expr</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>, <span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>) {
    <span class="kw">use</span> <span class="ident">Expr</span>::<span class="kw-2">*</span>;
    <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">expr</span> {
        <span class="ident">Literal</span> { <span class="kw-2">ref</span> <span class="ident">chars</span>, <span class="ident">casei</span>: <span class="bool-val">false</span> } <span class="op">=&gt;</span> {
            <span class="kw">let</span> <span class="ident">s</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">chars</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
            <span class="ident">lits</span>.<span class="ident">cross_add</span>(<span class="ident">s</span>.<span class="ident">as_bytes</span>());
        }
        <span class="ident">Literal</span> { <span class="kw-2">ref</span> <span class="ident">chars</span>, <span class="ident">casei</span>: <span class="bool-val">true</span> } <span class="op">=&gt;</span> {
            <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="ident">c</span> <span class="kw">in</span> <span class="ident">chars</span> {
                <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">CharClass</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">ClassRange</span> { <span class="ident">start</span>: <span class="ident">c</span>, <span class="ident">end</span>: <span class="ident">c</span> },
                ]).<span class="ident">case_fold</span>();
                <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">add_char_class</span>(<span class="kw-2">&amp;</span><span class="ident">cls</span>) {
                    <span class="ident">lits</span>.<span class="ident">cut</span>();
                    <span class="kw">return</span>;
                }
            }
        }
        <span class="ident">LiteralBytes</span> { <span class="kw-2">ref</span> <span class="ident">bytes</span>, <span class="ident">casei</span>: <span class="bool-val">false</span> } <span class="op">=&gt;</span> {
            <span class="ident">lits</span>.<span class="ident">cross_add</span>(<span class="ident">bytes</span>);
        }
        <span class="ident">LiteralBytes</span> { <span class="kw-2">ref</span> <span class="ident">bytes</span>, <span class="ident">casei</span>: <span class="bool-val">true</span> } <span class="op">=&gt;</span> {
            <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="ident">b</span> <span class="kw">in</span> <span class="ident">bytes</span> {
                <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">ByteClass</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">ByteRange</span> { <span class="ident">start</span>: <span class="ident">b</span>, <span class="ident">end</span>: <span class="ident">b</span> },
                ]).<span class="ident">case_fold</span>();
                <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">add_byte_class</span>(<span class="kw-2">&amp;</span><span class="ident">cls</span>) {
                    <span class="ident">lits</span>.<span class="ident">cut</span>();
                    <span class="kw">return</span>;
                }
            }
        }
        <span class="ident">Class</span>(<span class="kw-2">ref</span> <span class="ident">cls</span>) <span class="op">=&gt;</span> {
            <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">add_char_class</span>(<span class="ident">cls</span>) {
                <span class="ident">lits</span>.<span class="ident">cut</span>();
            }
        }
        <span class="ident">ClassBytes</span>(<span class="kw-2">ref</span> <span class="ident">cls</span>) <span class="op">=&gt;</span> {
            <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">add_byte_class</span>(<span class="ident">cls</span>) {
                <span class="ident">lits</span>.<span class="ident">cut</span>();
            }
        }
        <span class="ident">Group</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, .. } <span class="op">=&gt;</span> {
            <span class="ident">prefixes</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">lits</span>);
        }
        <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrOne</span>, .. } <span class="op">=&gt;</span> {
            <span class="ident">repeat_zero_or_one_literals</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">lits</span>, <span class="ident">prefixes</span>);
        }
        <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>, .. } <span class="op">=&gt;</span> {
            <span class="ident">repeat_zero_or_more_literals</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">lits</span>, <span class="ident">prefixes</span>);
        }
        <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">OneOrMore</span>, .. } <span class="op">=&gt;</span> {
            <span class="ident">repeat_one_or_more_literals</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">lits</span>, <span class="ident">prefixes</span>);
        }
        <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>, <span class="ident">max</span> }, <span class="ident">greedy</span> } <span class="op">=&gt;</span> {
            <span class="ident">repeat_range_literals</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">min</span>, <span class="ident">max</span>, <span class="ident">greedy</span>, <span class="ident">lits</span>, <span class="ident">prefixes</span>);
        }
        <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="kw">if</span> <span class="ident">es</span>.<span class="ident">is_empty</span>() <span class="op">=&gt;</span> {}
        <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="kw">if</span> <span class="ident">es</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> <span class="op">=&gt;</span> <span class="ident">prefixes</span>(<span class="kw-2">&amp;</span><span class="ident">es</span>[<span class="number">0</span>], <span class="ident">lits</span>),
        <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=&gt;</span> {
            <span class="kw">for</span> <span class="ident">e</span> <span class="kw">in</span> <span class="ident">es</span> {
                <span class="kw">if</span> <span class="kw">let</span> <span class="ident">StartText</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">e</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">is_empty</span>() {
                        <span class="ident">lits</span>.<span class="ident">cut</span>();
                        <span class="kw">break</span>;
                    }
                    <span class="ident">lits</span>.<span class="ident">add</span>(<span class="ident">Lit</span>::<span class="ident">empty</span>());
                    <span class="kw">continue</span>;
                }
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits2</span> <span class="op">=</span> <span class="ident">lits</span>.<span class="ident">to_empty</span>();
                <span class="ident">prefixes</span>(<span class="ident">e</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lits2</span>);
                <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">cross_product</span>(<span class="kw-2">&amp;</span><span class="ident">lits2</span>) <span class="op">||</span> <span class="op">!</span><span class="ident">lits2</span>.<span class="ident">any_complete</span>() {
                    <span class="comment">// If this expression couldn&#39;t yield any literal that</span>
                    <span class="comment">// could be extended, then we need to quit. Since we&#39;re</span>
                    <span class="comment">// short-circuiting, we also need to freeze every member.</span>
                    <span class="ident">lits</span>.<span class="ident">cut</span>();
                    <span class="kw">break</span>;
                }
            }
        }
        <span class="ident">Alternate</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=&gt;</span> {
            <span class="ident">alternate_literals</span>(<span class="ident">es</span>, <span class="ident">lits</span>, <span class="ident">prefixes</span>);
        }
        _ <span class="op">=&gt;</span> <span class="ident">lits</span>.<span class="ident">cut</span>(),
    }
}

<span class="kw">fn</span> <span class="ident">suffixes</span>(<span class="ident">expr</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>, <span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>) {
    <span class="kw">use</span> <span class="ident">Expr</span>::<span class="kw-2">*</span>;
    <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">expr</span> {
        <span class="ident">Literal</span> { <span class="kw-2">ref</span> <span class="ident">chars</span>, <span class="ident">casei</span>: <span class="bool-val">false</span> } <span class="op">=&gt;</span> {
            <span class="kw">let</span> <span class="ident">s</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">chars</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">into_bytes</span>();
            <span class="ident">bytes</span>.<span class="ident">reverse</span>();
            <span class="ident">lits</span>.<span class="ident">cross_add</span>(<span class="kw-2">&amp;</span><span class="ident">bytes</span>);
        }
        <span class="ident">Literal</span> { <span class="kw-2">ref</span> <span class="ident">chars</span>, <span class="ident">casei</span>: <span class="bool-val">true</span> } <span class="op">=&gt;</span> {
            <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="ident">c</span> <span class="kw">in</span> <span class="ident">chars</span>.<span class="ident">iter</span>().<span class="ident">rev</span>() {
                <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">CharClass</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">ClassRange</span> { <span class="ident">start</span>: <span class="ident">c</span>, <span class="ident">end</span>: <span class="ident">c</span> },
                ]).<span class="ident">case_fold</span>();
                <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">add_char_class_reverse</span>(<span class="kw-2">&amp;</span><span class="ident">cls</span>) {
                    <span class="ident">lits</span>.<span class="ident">cut</span>();
                    <span class="kw">return</span>;
                }
            }
        }
        <span class="ident">LiteralBytes</span> { <span class="kw-2">ref</span> <span class="ident">bytes</span>, <span class="ident">casei</span>: <span class="bool-val">false</span> } <span class="op">=&gt;</span> {
            <span class="kw">let</span> <span class="ident">b</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">bytes</span>.<span class="ident">iter</span>().<span class="ident">rev</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
            <span class="ident">lits</span>.<span class="ident">cross_add</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>);
        }
        <span class="ident">LiteralBytes</span> { <span class="kw-2">ref</span> <span class="ident">bytes</span>, <span class="ident">casei</span>: <span class="bool-val">true</span> } <span class="op">=&gt;</span> {
            <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="ident">b</span> <span class="kw">in</span> <span class="ident">bytes</span>.<span class="ident">iter</span>().<span class="ident">rev</span>() {
                <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">ByteClass</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="ident">ByteRange</span> { <span class="ident">start</span>: <span class="ident">b</span>, <span class="ident">end</span>: <span class="ident">b</span> },
                ]).<span class="ident">case_fold</span>();
                <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">add_byte_class</span>(<span class="kw-2">&amp;</span><span class="ident">cls</span>) {
                    <span class="ident">lits</span>.<span class="ident">cut</span>();
                    <span class="kw">return</span>;
                }
            }
        }
        <span class="ident">Class</span>(<span class="kw-2">ref</span> <span class="ident">cls</span>) <span class="op">=&gt;</span> {
            <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">add_char_class_reverse</span>(<span class="ident">cls</span>) {
                <span class="ident">lits</span>.<span class="ident">cut</span>();
            }
        }
        <span class="ident">ClassBytes</span>(<span class="kw-2">ref</span> <span class="ident">cls</span>) <span class="op">=&gt;</span> {
            <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">add_byte_class</span>(<span class="ident">cls</span>) {
                <span class="ident">lits</span>.<span class="ident">cut</span>();
            }
        }
        <span class="ident">Group</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, .. } <span class="op">=&gt;</span> {
            <span class="ident">suffixes</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">lits</span>);
        }
        <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrOne</span>, .. } <span class="op">=&gt;</span> {
            <span class="ident">repeat_zero_or_one_literals</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">lits</span>, <span class="ident">suffixes</span>);
        }
        <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>, .. } <span class="op">=&gt;</span> {
            <span class="ident">repeat_zero_or_more_literals</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">lits</span>, <span class="ident">suffixes</span>);
        }
        <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">OneOrMore</span>, .. } <span class="op">=&gt;</span> {
            <span class="ident">repeat_one_or_more_literals</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">lits</span>, <span class="ident">suffixes</span>);
        }
        <span class="ident">Repeat</span> { <span class="kw-2">ref</span> <span class="ident">e</span>, <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>, <span class="ident">max</span> }, <span class="ident">greedy</span> } <span class="op">=&gt;</span> {
            <span class="ident">repeat_range_literals</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">e</span>, <span class="ident">min</span>, <span class="ident">max</span>, <span class="ident">greedy</span>, <span class="ident">lits</span>, <span class="ident">suffixes</span>);
        }
        <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="kw">if</span> <span class="ident">es</span>.<span class="ident">is_empty</span>() <span class="op">=&gt;</span> {}
        <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="kw">if</span> <span class="ident">es</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> <span class="op">=&gt;</span> <span class="ident">suffixes</span>(<span class="kw-2">&amp;</span><span class="ident">es</span>[<span class="number">0</span>], <span class="ident">lits</span>),
        <span class="ident">Concat</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=&gt;</span> {
            <span class="kw">for</span> <span class="ident">e</span> <span class="kw">in</span> <span class="ident">es</span>.<span class="ident">iter</span>().<span class="ident">rev</span>() {
                <span class="kw">if</span> <span class="kw">let</span> <span class="ident">EndText</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">e</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">is_empty</span>() {
                        <span class="ident">lits</span>.<span class="ident">cut</span>();
                        <span class="kw">break</span>;
                    }
                    <span class="ident">lits</span>.<span class="ident">add</span>(<span class="ident">Lit</span>::<span class="ident">empty</span>());
                    <span class="kw">continue</span>;
                }
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits2</span> <span class="op">=</span> <span class="ident">lits</span>.<span class="ident">to_empty</span>();
                <span class="ident">suffixes</span>(<span class="ident">e</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lits2</span>);
                <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">cross_product</span>(<span class="kw-2">&amp;</span><span class="ident">lits2</span>) <span class="op">||</span> <span class="op">!</span><span class="ident">lits2</span>.<span class="ident">any_complete</span>() {
                    <span class="comment">// If this expression couldn&#39;t yield any literal that</span>
                    <span class="comment">// could be extended, then we need to quit. Since we&#39;re</span>
                    <span class="comment">// short-circuiting, we also need to freeze every member.</span>
                    <span class="ident">lits</span>.<span class="ident">cut</span>();
                    <span class="kw">break</span>;
                }
            }
        }
        <span class="ident">Alternate</span>(<span class="kw-2">ref</span> <span class="ident">es</span>) <span class="op">=&gt;</span> {
            <span class="ident">alternate_literals</span>(<span class="ident">es</span>, <span class="ident">lits</span>, <span class="ident">suffixes</span>);
        }
        _ <span class="op">=&gt;</span> <span class="ident">lits</span>.<span class="ident">cut</span>(),
    }
}

<span class="kw">fn</span> <span class="ident">repeat_zero_or_one_literals</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">Expr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>)<span class="op">&gt;</span>(
    <span class="ident">e</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>,
    <span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>,
    <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>,
) {
    <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">lits2</span>, <span class="kw-2">mut</span> <span class="ident">lits3</span>) <span class="op">=</span> (<span class="ident">lits</span>.<span class="ident">clone</span>(), <span class="ident">lits</span>.<span class="ident">to_empty</span>());
    <span class="ident">lits3</span>.<span class="ident">set_limit_size</span>(<span class="ident">lits</span>.<span class="ident">limit_size</span>() <span class="op">/</span> <span class="number">2</span>);
    <span class="ident">f</span>(<span class="ident">e</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lits3</span>);

    <span class="kw">if</span> <span class="ident">lits3</span>.<span class="ident">is_empty</span>() <span class="op">||</span> <span class="op">!</span><span class="ident">lits2</span>.<span class="ident">cross_product</span>(<span class="kw-2">&amp;</span><span class="ident">lits3</span>) {
        <span class="ident">lits</span>.<span class="ident">cut</span>();
        <span class="kw">return</span>;
    }
    <span class="ident">lits2</span>.<span class="ident">add</span>(<span class="ident">Lit</span>::<span class="ident">empty</span>());
    <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">union</span>(<span class="ident">lits2</span>) {
        <span class="ident">lits</span>.<span class="ident">cut</span>();
    }
}

<span class="kw">fn</span> <span class="ident">repeat_zero_or_more_literals</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">Expr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>)<span class="op">&gt;</span>(
    <span class="ident">e</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>,
    <span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>,
    <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>,
) {
    <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">lits2</span>, <span class="kw-2">mut</span> <span class="ident">lits3</span>) <span class="op">=</span> (<span class="ident">lits</span>.<span class="ident">clone</span>(), <span class="ident">lits</span>.<span class="ident">to_empty</span>());
    <span class="ident">lits3</span>.<span class="ident">set_limit_size</span>(<span class="ident">lits</span>.<span class="ident">limit_size</span>() <span class="op">/</span> <span class="number">2</span>);
    <span class="ident">f</span>(<span class="ident">e</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lits3</span>);

    <span class="kw">if</span> <span class="ident">lits3</span>.<span class="ident">is_empty</span>() <span class="op">||</span> <span class="op">!</span><span class="ident">lits2</span>.<span class="ident">cross_product</span>(<span class="kw-2">&amp;</span><span class="ident">lits3</span>) {
        <span class="ident">lits</span>.<span class="ident">cut</span>();
        <span class="kw">return</span>;
    }
    <span class="ident">lits2</span>.<span class="ident">cut</span>();
    <span class="ident">lits2</span>.<span class="ident">add</span>(<span class="ident">Lit</span>::<span class="ident">empty</span>());
    <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">union</span>(<span class="ident">lits2</span>) {
        <span class="ident">lits</span>.<span class="ident">cut</span>();
    }
}

<span class="kw">fn</span> <span class="ident">repeat_one_or_more_literals</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">Expr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>)<span class="op">&gt;</span>(
    <span class="ident">e</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>,
    <span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>,
    <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>,
) {
    <span class="ident">f</span>(<span class="ident">e</span>, <span class="ident">lits</span>);
    <span class="ident">lits</span>.<span class="ident">cut</span>();
}

<span class="kw">fn</span> <span class="ident">repeat_range_literals</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">Expr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>)<span class="op">&gt;</span>(
    <span class="ident">e</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>,
    <span class="ident">min</span>: <span class="ident">u32</span>,
    <span class="ident">max</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,
    <span class="ident">greedy</span>: <span class="ident">bool</span>,
    <span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>,
    <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>,
) {
    <span class="kw">use</span> <span class="ident">Expr</span>::<span class="kw-2">*</span>;

    <span class="kw">if</span> <span class="ident">min</span> <span class="op">==</span> <span class="number">0</span> {
        <span class="comment">// This is a bit conservative. If `max` is set, then we could</span>
        <span class="comment">// treat this as a finite set of alternations. For now, we</span>
        <span class="comment">// just treat it as `e*`.</span>
        <span class="ident">f</span>(<span class="kw-2">&amp;</span><span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">e</span>.<span class="ident">clone</span>()),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>,
            <span class="ident">greedy</span>: <span class="ident">greedy</span>,
        }, <span class="ident">lits</span>);
    } <span class="kw">else</span> {
        <span class="kw">if</span> <span class="ident">min</span> <span class="op">&gt;</span> <span class="number">0</span> {
            <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">lits</span>.<span class="ident">limit_size</span>, <span class="ident">min</span> <span class="kw">as</span> <span class="ident">usize</span>);
            <span class="kw">let</span> <span class="ident">es</span> <span class="op">=</span> <span class="ident">iter</span>::<span class="ident">repeat</span>(<span class="ident">e</span>.<span class="ident">clone</span>()).<span class="ident">take</span>(<span class="ident">n</span>).<span class="ident">collect</span>();
            <span class="ident">f</span>(<span class="kw-2">&amp;</span><span class="ident">Concat</span>(<span class="ident">es</span>), <span class="ident">lits</span>);
            <span class="kw">if</span> <span class="ident">n</span> <span class="op">&lt;</span> <span class="ident">min</span> <span class="kw">as</span> <span class="ident">usize</span> {
                <span class="ident">lits</span>.<span class="ident">cut</span>();
            }
        }
        <span class="kw">if</span> <span class="ident">max</span>.<span class="ident">map_or</span>(<span class="bool-val">true</span>, <span class="op">|</span><span class="ident">max</span><span class="op">|</span> <span class="ident">min</span> <span class="op">&lt;</span> <span class="ident">max</span>) {
            <span class="ident">lits</span>.<span class="ident">cut</span>();
        }
    }
}

<span class="kw">fn</span> <span class="ident">alternate_literals</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">Expr</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>)<span class="op">&gt;</span>(
    <span class="ident">es</span>: <span class="kw-2">&amp;</span>[<span class="ident">Expr</span>],
    <span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>,
    <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>,
) {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits2</span> <span class="op">=</span> <span class="ident">lits</span>.<span class="ident">to_empty</span>();
    <span class="kw">for</span> <span class="ident">e</span> <span class="kw">in</span> <span class="ident">es</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits3</span> <span class="op">=</span> <span class="ident">lits</span>.<span class="ident">to_empty</span>();
        <span class="ident">lits3</span>.<span class="ident">set_limit_size</span>(<span class="ident">lits</span>.<span class="ident">limit_size</span>() <span class="op">/</span> <span class="number">5</span>);
        <span class="ident">f</span>(<span class="ident">e</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lits3</span>);
        <span class="kw">if</span> <span class="ident">lits3</span>.<span class="ident">is_empty</span>() <span class="op">||</span> <span class="op">!</span><span class="ident">lits2</span>.<span class="ident">union</span>(<span class="ident">lits3</span>) {
            <span class="comment">// If we couldn&#39;t find suffixes for *any* of the</span>
            <span class="comment">// alternates, then the entire alternation has to be thrown</span>
            <span class="comment">// away and any existing members must be frozen. Similarly,</span>
            <span class="comment">// if the union couldn&#39;t complete, stop and freeze.</span>
            <span class="ident">lits</span>.<span class="ident">cut</span>();
            <span class="kw">return</span>;
        }
    }
    <span class="kw">if</span> <span class="op">!</span><span class="ident">lits</span>.<span class="ident">cross_product</span>(<span class="kw-2">&amp;</span><span class="ident">lits2</span>) {
        <span class="ident">lits</span>.<span class="ident">cut</span>();
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Literals</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">&quot;Literals&quot;</span>)
         .<span class="ident">field</span>(<span class="string">&quot;lits&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">lits</span>)
         .<span class="ident">field</span>(<span class="string">&quot;limit_size&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">limit_size</span>)
         .<span class="ident">field</span>(<span class="string">&quot;limit_class&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">limit_class</span>)
         .<span class="ident">finish</span>()
    }
}

<span class="kw">impl</span> <span class="ident">Lit</span> {
    <span class="doccomment">/// Returns a new complete literal with the bytes given.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">bytes</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">Lit</span> {
        <span class="ident">Lit</span> { <span class="ident">v</span>: <span class="ident">bytes</span>, <span class="ident">cut</span>: <span class="bool-val">false</span> }
    }

    <span class="doccomment">/// Returns a new complete empty literal.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">empty</span>() <span class="op">-&gt;</span> <span class="ident">Lit</span> {
        <span class="ident">Lit</span> { <span class="ident">v</span>: <span class="macro">vec</span><span class="macro">!</span>[], <span class="ident">cut</span>: <span class="bool-val">false</span> }
    }

    <span class="doccomment">/// Returns true if this literal was &quot;cut.&quot;</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_cut</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">cut</span>
    }

    <span class="doccomment">/// Cuts this literal.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">cut</span> <span class="op">=</span> <span class="bool-val">true</span>;
    }
}

<span class="kw">impl</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">Lit</span> {
    <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">Lit</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">v</span> <span class="op">==</span> <span class="ident">other</span>.<span class="ident">v</span>
    }
}

<span class="kw">impl</span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">Lit</span> {
    <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">Lit</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">partial_cmp</span>(<span class="kw-2">&amp;</span><span class="ident">other</span>.<span class="ident">v</span>)
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Lit</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_cut</span>() {
            <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;Cut({})&quot;</span>, <span class="ident">escape_unicode</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">v</span>))
        } <span class="kw">else</span> {
            <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;Complete({})&quot;</span>, <span class="ident">escape_unicode</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">v</span>))
        }
    }
}

<span class="kw">impl</span> <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Lit</span> {
    <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">u8</span>] { <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">v</span> }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">Lit</span> {
    <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>;
    <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> { <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">v</span> }
}

<span class="kw">impl</span> <span class="ident">ops</span>::<span class="ident">DerefMut</span> <span class="kw">for</span> <span class="ident">Lit</span> {
    <span class="kw">fn</span> <span class="ident">deref_mut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> { <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span> }
}

<span class="kw">fn</span> <span class="ident">position</span>(<span class="ident">needle</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>], <span class="kw-2">mut</span> <span class="ident">haystack</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
    <span class="kw">while</span> <span class="ident">haystack</span>.<span class="ident">len</span>() <span class="op">&gt;=</span> <span class="ident">needle</span>.<span class="ident">len</span>() {
        <span class="kw">if</span> <span class="ident">needle</span> <span class="op">==</span> <span class="kw-2">&amp;</span><span class="ident">haystack</span>[..<span class="ident">needle</span>.<span class="ident">len</span>()] {
            <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">i</span>);
        }
        <span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>;
        <span class="ident">haystack</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">haystack</span>[<span class="number">1</span>..];
    }
    <span class="prelude-val">None</span>
}

<span class="kw">fn</span> <span class="ident">escape_unicode</span>(<span class="ident">bytes</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">String</span> {
    <span class="kw">let</span> <span class="ident">show</span> <span class="op">=</span> <span class="kw">match</span> ::<span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="ident">bytes</span>) {
        <span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=&gt;</span> <span class="ident">v</span>.<span class="ident">to_string</span>(),
        <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="ident">escape_bytes</span>(<span class="ident">bytes</span>),
    };
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">space_escaped</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="ident">show</span>.<span class="ident">chars</span>() {
        <span class="kw">if</span> <span class="ident">c</span>.<span class="ident">is_whitespace</span>() {
            <span class="kw">let</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">c</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">&lt;=</span> <span class="number">0x7F</span> {
                <span class="ident">escape_byte</span>(<span class="ident">c</span> <span class="kw">as</span> <span class="ident">u8</span>)
            } <span class="kw">else</span> {
                <span class="kw">if</span> <span class="ident">c</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">&lt;=</span> <span class="number">0xFFFF</span> {
                    <span class="macro">format</span><span class="macro">!</span>(<span class="string">r&quot;\u{{{:04x}}}&quot;</span>, <span class="ident">c</span> <span class="kw">as</span> <span class="ident">u32</span>)
                } <span class="kw">else</span> {
                    <span class="macro">format</span><span class="macro">!</span>(<span class="string">r&quot;\U{{{:08x}}}&quot;</span>, <span class="ident">c</span> <span class="kw">as</span> <span class="ident">u32</span>)
                }
            };
            <span class="ident">space_escaped</span>.<span class="ident">push_str</span>(<span class="kw-2">&amp;</span><span class="ident">escaped</span>);
        } <span class="kw">else</span> {
            <span class="ident">space_escaped</span>.<span class="ident">push</span>(<span class="ident">c</span>);
        }
    }
    <span class="ident">space_escaped</span>
}

<span class="kw">fn</span> <span class="ident">escape_bytes</span>(<span class="ident">bytes</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>]) <span class="op">-&gt;</span> <span class="ident">String</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="ident">b</span> <span class="kw">in</span> <span class="ident">bytes</span> {
        <span class="ident">s</span>.<span class="ident">push_str</span>(<span class="kw-2">&amp;</span><span class="ident">escape_byte</span>(<span class="ident">b</span>));
    }
    <span class="ident">s</span>
}

<span class="kw">fn</span> <span class="ident">escape_byte</span>(<span class="ident">byte</span>: <span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">String</span> {
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ascii</span>::<span class="ident">escape_default</span>;

    <span class="kw">let</span> <span class="ident">escaped</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">escape_default</span>(<span class="ident">byte</span>).<span class="ident">collect</span>();
    <span class="ident">String</span>::<span class="ident">from_utf8_lossy</span>(<span class="kw-2">&amp;</span><span class="ident">escaped</span>).<span class="ident">into_owned</span>()
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;

    <span class="kw">use</span> {<span class="ident">Expr</span>, <span class="ident">ExprBuilder</span>};
    <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Literals</span>, <span class="ident">Lit</span>, <span class="ident">escape_bytes</span>};

    <span class="comment">// To make test failures easier to read.</span>
    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
    <span class="kw">struct</span> <span class="ident">Bytes</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ULit</span><span class="op">&gt;</span>);
    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
    <span class="kw">struct</span> <span class="ident">Unicode</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ULit</span><span class="op">&gt;</span>);

    <span class="kw">fn</span> <span class="ident">escape_lits</span>(<span class="ident">blits</span>: <span class="kw-2">&amp;</span>[<span class="ident">Lit</span>]) <span class="op">-&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ULit</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ulits</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
        <span class="kw">for</span> <span class="ident">blit</span> <span class="kw">in</span> <span class="ident">blits</span> {
            <span class="ident">ulits</span>.<span class="ident">push</span>(<span class="ident">ULit</span> { <span class="ident">v</span>: <span class="ident">escape_bytes</span>(<span class="kw-2">&amp;</span><span class="ident">blit</span>), <span class="ident">cut</span>: <span class="ident">blit</span>.<span class="ident">is_cut</span>() });
        }
        <span class="ident">ulits</span>
    }

    <span class="kw">fn</span> <span class="ident">create_lits</span><span class="op">&lt;</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op">&lt;</span><span class="ident">Item</span><span class="op">=</span><span class="ident">Lit</span><span class="op">&gt;&gt;</span>(<span class="ident">it</span>: <span class="ident">I</span>) <span class="op">-&gt;</span> <span class="ident">Literals</span> {
        <span class="ident">Literals</span> {
            <span class="ident">lits</span>: <span class="ident">it</span>.<span class="ident">into_iter</span>().<span class="ident">collect</span>(),
            <span class="ident">limit_size</span>: <span class="number">0</span>,
            <span class="ident">limit_class</span>: <span class="number">0</span>,
        }
    }

    <span class="comment">// Needs to be pub for 1.3?</span>
    <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>)]</span>
    <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ULit</span> {
        <span class="ident">v</span>: <span class="ident">String</span>,
        <span class="ident">cut</span>: <span class="ident">bool</span>,
    }

    <span class="kw">impl</span> <span class="ident">ULit</span> {
        <span class="kw">fn</span> <span class="ident">is_cut</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">cut</span> }
    }

    <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">ULit</span> {
        <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_cut</span>() {
                <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;Cut({})&quot;</span>, <span class="self">self</span>.<span class="ident">v</span>)
            } <span class="kw">else</span> {
                <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;Complete({})&quot;</span>, <span class="self">self</span>.<span class="ident">v</span>)
            }
        }
    }

    <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op">&lt;</span><span class="ident">Lit</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">ULit</span> {
        <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">Lit</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
            <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">as_bytes</span>() <span class="op">==</span> <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">other</span>.<span class="ident">v</span> <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">is_cut</span>() <span class="op">==</span> <span class="ident">other</span>.<span class="ident">is_cut</span>()
        }
    }

    <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op">&lt;</span><span class="ident">ULit</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Lit</span> {
        <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">ULit</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
            <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">v</span> <span class="op">==</span> <span class="ident">other</span>.<span class="ident">v</span>.<span class="ident">as_bytes</span>() <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">is_cut</span>() <span class="op">==</span> <span class="ident">other</span>.<span class="ident">is_cut</span>()
        }
    }

    <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>)]</span>
    <span class="kw">fn</span> <span class="ident">C</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">ULit</span> { <span class="ident">ULit</span> { <span class="ident">v</span>: <span class="ident">s</span>.<span class="ident">to_owned</span>(), <span class="ident">cut</span>: <span class="bool-val">true</span> } }
    <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>)]</span>
    <span class="kw">fn</span> <span class="ident">M</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">ULit</span> { <span class="ident">ULit</span> { <span class="ident">v</span>: <span class="ident">s</span>.<span class="ident">to_owned</span>(), <span class="ident">cut</span>: <span class="bool-val">false</span> } }

    <span class="kw">fn</span> <span class="ident">prefixes</span>(<span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>, <span class="ident">expr</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>) {
        <span class="ident">lits</span>.<span class="ident">union_prefixes</span>(<span class="ident">expr</span>);
    }

    <span class="kw">fn</span> <span class="ident">suffixes</span>(<span class="ident">lits</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Literals</span>, <span class="ident">expr</span>: <span class="kw-2">&amp;</span><span class="ident">Expr</span>) {
        <span class="ident">lits</span>.<span class="ident">union_suffixes</span>(<span class="ident">expr</span>);
    }

    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">assert_lit_eq</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">got_lits</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected_lit</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=&gt;</span> {{
            <span class="kw">let</span> <span class="ident">expected</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">ULit</span><span class="op">&gt;</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected_lit</span>),<span class="kw-2">*</span>];
            <span class="kw">let</span> <span class="ident">lits</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">got_lits</span>;
            <span class="macro">assert_eq</span><span class="macro">!</span>(
                <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>(<span class="ident">expected</span>.<span class="ident">clone</span>()),
                <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>(<span class="ident">escape_lits</span>(<span class="ident">lits</span>.<span class="ident">literals</span>())));
            <span class="macro">assert_eq</span><span class="macro">!</span>(
                <span class="op">!</span><span class="ident">expected</span>.<span class="ident">is_empty</span>() <span class="op">&amp;&amp;</span> <span class="ident">expected</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">l</span><span class="op">|</span> <span class="op">!</span><span class="ident">l</span>.<span class="ident">is_cut</span>()),
                <span class="ident">lits</span>.<span class="ident">all_complete</span>());
            <span class="macro">assert_eq</span><span class="macro">!</span>(
                <span class="ident">expected</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">l</span><span class="op">|</span> <span class="op">!</span><span class="ident">l</span>.<span class="ident">is_cut</span>()),
                <span class="ident">lits</span>.<span class="ident">any_complete</span>());
        }};
    }

    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_lit</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            <span class="macro">test_lit</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>,);
        };
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">lit</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=&gt;</span> {
            <span class="attribute">#[<span class="ident">test</span>]</span>
            <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>() {
                <span class="kw">let</span> <span class="ident">expr</span> <span class="op">=</span> <span class="ident">Expr</span>::<span class="ident">parse</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>).<span class="ident">unwrap</span>();
                <span class="kw">let</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">expr</span>.<span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>();
                <span class="macro">assert_lit_eq</span><span class="macro">!</span>(<span class="ident">Unicode</span>, <span class="ident">lits</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">lit</span>),<span class="kw-2">*</span>);

                <span class="kw">let</span> <span class="ident">expr</span> <span class="op">=</span> <span class="ident">ExprBuilder</span>::<span class="ident">new</span>().<span class="ident">allow_bytes</span>(<span class="bool-val">true</span>).<span class="ident">unicode</span>(<span class="bool-val">false</span>)
                                       .<span class="ident">parse</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>).<span class="ident">unwrap</span>();
                <span class="kw">let</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">expr</span>.<span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>();
                <span class="macro">assert_lit_eq</span><span class="macro">!</span>(<span class="ident">Bytes</span>, <span class="ident">lits</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">lit</span>),<span class="kw-2">*</span>);
            }
        };
    }

    <span class="comment">// ************************************************************************</span>
    <span class="comment">// Tests for prefix literal extraction.</span>
    <span class="comment">// ************************************************************************</span>

    <span class="comment">// Elementary tests.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_one_lit1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_one_lit2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;abc&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_one_lit3</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?u)☃&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x98\\x83&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_one_lit4</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?ui)☃&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x98\\x83&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_class1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;[1-4]&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;1&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;2&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;3&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;4&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_class2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?u)[☃Ⅰ]&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x85\\xa0&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x98\\x83&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_class3</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?ui)[☃Ⅰ]&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x85\\xa0&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x85\\xb0&quot;</span>),
              <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x98\\x83&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_one_lit_casei1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?i)a&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;A&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_one_lit_casei2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?i)abc&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;ABC&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;aBC&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;AbC&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;abC&quot;</span>),
              <span class="ident">M</span>(<span class="string">&quot;ABc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;aBc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Abc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_group1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(a)&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_zero_or_one1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a?&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_zero_or_one2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?:abc)?&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_zero_or_more1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a*&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_zero_or_more2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?:abc)*&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_one_or_more1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_one_or_more2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?:abc)+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;abc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_nested_one_or_more</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?:a+)+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_range1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a{0}&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_range2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a{0,}&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_range3</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a{0,1}&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_range4</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a{1}&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_range5</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a{2}&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;aa&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_range6</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a{1,2}&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_rep_range7</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a{2,3}&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;aa&quot;</span>));

    <span class="comment">// Test regexes with concatenations.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?:a)(?:b)&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;ab&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;[ab]z&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;az&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bz&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat3</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?i)[ab]z&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;AZ&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;BZ&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;aZ&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bZ&quot;</span>),
              <span class="ident">M</span>(<span class="string">&quot;Az&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Bz&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;az&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bz&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat4</span>, <span class="ident">prefixes</span>, <span class="string">&quot;[ab][yz]&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;ay&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;by&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;az&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bz&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat5</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a*b&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat6</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a*b*c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat7</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a*b*c+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;c&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat8</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a*b+c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat9</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a*b+c*&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat10</span>, <span class="ident">prefixes</span>, <span class="string">&quot;ab*&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat11</span>, <span class="ident">prefixes</span>, <span class="string">&quot;ab*c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;ac&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat12</span>, <span class="ident">prefixes</span>, <span class="string">&quot;ab+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat13</span>, <span class="ident">prefixes</span>, <span class="string">&quot;ab+c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat14</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a^&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat15</span>, <span class="ident">prefixes</span>, <span class="string">&quot;$a&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat16</span>, <span class="ident">prefixes</span>, <span class="string">r&quot;ab*c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;ac&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat17</span>, <span class="ident">prefixes</span>, <span class="string">r&quot;ab+c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat18</span>, <span class="ident">prefixes</span>, <span class="string">r&quot;z*azb&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;z&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;azb&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_cat19</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a.z&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>));

    <span class="comment">// Test regexes with alternations.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_alt1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a|b&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_alt2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;[1-3]|b&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;1&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;2&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;3&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_alt3</span>, <span class="ident">prefixes</span>, <span class="string">&quot;y(?:a|b)z&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;yaz&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;ybz&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_alt4</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a|b*&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_alt5</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a|b+&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_alt6</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a|(?:b|c*)&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_alt7</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(a|b)*c|(a|ab)*c&quot;</span>,
              <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_alt8</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a*b|c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>));

    <span class="comment">// Test regexes with empty assertions.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_empty1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;^a&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_empty2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;^abc&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_empty3</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?:^abc)|(?:^z)&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;z&quot;</span>));

    <span class="comment">// Make sure some curious regexes have no prefixes.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_nothing1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;.&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_nothing2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?s).&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_nothing3</span>, <span class="ident">prefixes</span>, <span class="string">&quot;^&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_nothing4</span>, <span class="ident">prefixes</span>, <span class="string">&quot;$&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_nothing6</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?m)$&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_nothing7</span>, <span class="ident">prefixes</span>, <span class="string">r&quot;\b&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_nothing8</span>, <span class="ident">prefixes</span>, <span class="string">r&quot;\B&quot;</span>);

    <span class="comment">// Test a few regexes that defeat any prefix literal detection.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;.a&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?s).a&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated3</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a*b*c*&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated4</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a|.&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated5</span>, <span class="ident">prefixes</span>, <span class="string">&quot;.|a&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated6</span>, <span class="ident">prefixes</span>, <span class="string">&quot;a|^&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated7</span>, <span class="ident">prefixes</span>, <span class="string">&quot;.(?:a(?:b)(?:c))&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated8</span>, <span class="ident">prefixes</span>, <span class="string">&quot;$a&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated9</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?m)$a&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated10</span>, <span class="ident">prefixes</span>, <span class="string">r&quot;\ba&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated11</span>, <span class="ident">prefixes</span>, <span class="string">r&quot;\Ba&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated12</span>, <span class="ident">prefixes</span>, <span class="string">&quot;^*a&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">pfx_defeated13</span>, <span class="ident">prefixes</span>, <span class="string">&quot;^+a&quot;</span>);

    <span class="macro">test_lit</span><span class="macro">!</span>(
        <span class="ident">pfx_crazy1</span>,
        <span class="ident">prefixes</span>,
        <span class="string">r&quot;M[ou]&#39;?am+[ae]r .*([AEae]l[- ])?[GKQ]h?[aeu]+([dtz][dhz]?)+af[iy]&quot;</span>,
        <span class="ident">C</span>(<span class="string">&quot;Mo\\&#39;am&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;Mu\\&#39;am&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;Moam&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;Muam&quot;</span>));

    <span class="comment">// ************************************************************************</span>
    <span class="comment">// Tests for quiting prefix literal search.</span>
    <span class="comment">// ************************************************************************</span>

    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_exhausted</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>,);
        };
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">lit</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=&gt;</span> {
            <span class="attribute">#[<span class="ident">test</span>]</span>
            <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>() {
                <span class="kw">let</span> <span class="ident">expr</span> <span class="op">=</span> <span class="ident">Expr</span>::<span class="ident">parse</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>).<span class="ident">unwrap</span>();
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">Literals</span>::<span class="ident">empty</span>();
                <span class="ident">lits</span>.<span class="ident">set_limit_size</span>(<span class="number">20</span>).<span class="ident">set_limit_class</span>(<span class="number">10</span>);
                <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lits</span>, <span class="kw-2">&amp;</span><span class="ident">expr</span>);
                <span class="macro">assert_lit_eq</span><span class="macro">!</span>(<span class="ident">Unicode</span>, <span class="ident">lits</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">lit</span>),<span class="kw-2">*</span>);

                <span class="kw">let</span> <span class="ident">expr</span> <span class="op">=</span> <span class="ident">ExprBuilder</span>::<span class="ident">new</span>().<span class="ident">allow_bytes</span>(<span class="bool-val">true</span>).<span class="ident">unicode</span>(<span class="bool-val">false</span>)
                                       .<span class="ident">parse</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>).<span class="ident">unwrap</span>();
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">Literals</span>::<span class="ident">empty</span>();
                <span class="ident">lits</span>.<span class="ident">set_limit_size</span>(<span class="number">20</span>).<span class="ident">set_limit_class</span>(<span class="number">10</span>);
                <span class="macro-nonterminal">$</span><span class="macro-nonterminal">which</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">lits</span>, <span class="kw-2">&amp;</span><span class="ident">expr</span>);
                <span class="macro">assert_lit_eq</span><span class="macro">!</span>(<span class="ident">Bytes</span>, <span class="ident">lits</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">lit</span>),<span class="kw-2">*</span>);
            }
        };
    }

    <span class="comment">// These test use a much lower limit than the default so that we can</span>
    <span class="comment">// write test cases of reasonable size.</span>
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">pfx_exhausted1</span>, <span class="ident">prefixes</span>, <span class="string">&quot;[a-z]&quot;</span>);
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">pfx_exhausted2</span>, <span class="ident">prefixes</span>, <span class="string">&quot;[a-z]*A&quot;</span>);
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">pfx_exhausted3</span>, <span class="ident">prefixes</span>, <span class="string">&quot;A[a-z]Z&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;A&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">pfx_exhausted4</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?i)foobar&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;FO&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;fO&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;Fo&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;fo&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">pfx_exhausted5</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?:ab){100}&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;abababababababababab&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">pfx_exhausted6</span>, <span class="ident">prefixes</span>, <span class="string">&quot;(?:(?:ab){100})*cd&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;ababababab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;cd&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">pfx_exhausted7</span>, <span class="ident">prefixes</span>, <span class="string">&quot;z(?:(?:ab){100})*cd&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;zababababab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;zcd&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">pfx_exhausted8</span>, <span class="ident">prefixes</span>, <span class="string">&quot;aaaaaaaaaaaaaaaaaaaaz&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;aaaaaaaaaaaaaaaaaaaa&quot;</span>));

    <span class="comment">// ************************************************************************</span>
    <span class="comment">// Tests for suffix literal extraction.</span>
    <span class="comment">// ************************************************************************</span>

    <span class="comment">// Elementary tests.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_one_lit1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_one_lit2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;abc&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_one_lit3</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?u)☃&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x98\\x83&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_one_lit4</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?ui)☃&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x98\\x83&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_class1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;[1-4]&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;1&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;2&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;3&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;4&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_class2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?u)[☃Ⅰ]&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x85\\xa0&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x98\\x83&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_class3</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?ui)[☃Ⅰ]&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x85\\xa0&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x85\\xb0&quot;</span>),
              <span class="ident">M</span>(<span class="string">&quot;\\xe2\\x98\\x83&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_one_lit_casei1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?i)a&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;A&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_one_lit_casei2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?i)abc&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;ABC&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;ABc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;AbC&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Abc&quot;</span>),
              <span class="ident">M</span>(<span class="string">&quot;aBC&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;aBc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;abC&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_group1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(a)&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_zero_or_one1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a?&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_zero_or_one2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?:abc)?&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_zero_or_more1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a*&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_zero_or_more2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?:abc)*&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_one_or_more1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_one_or_more2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?:abc)+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;abc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_nested_one_or_more</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?:a+)+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_range1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a{0}&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_range2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a{0,}&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_range3</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a{0,1}&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_range4</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a{1}&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_range5</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a{2}&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;aa&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_range6</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a{1,2}&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_rep_range7</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a{2,3}&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;aa&quot;</span>));

    <span class="comment">// Test regexes with concatenations.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?:a)(?:b)&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;ab&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;[ab]z&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;az&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bz&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat3</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?i)[ab]z&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;AZ&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Az&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;BZ&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Bz&quot;</span>),
              <span class="ident">M</span>(<span class="string">&quot;aZ&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;az&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bZ&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bz&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat4</span>, <span class="ident">suffixes</span>, <span class="string">&quot;[ab][yz]&quot;</span>,
              <span class="ident">M</span>(<span class="string">&quot;ay&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;az&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;by&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bz&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat5</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a*b&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat6</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a*b*c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;bc&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;ac&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat7</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a*b*c+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;c&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat8</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a*b+c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;bc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat9</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a*b+c*&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;c&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat10</span>, <span class="ident">suffixes</span>, <span class="string">&quot;ab*&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat11</span>, <span class="ident">suffixes</span>, <span class="string">&quot;ab*c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;bc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;ac&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat12</span>, <span class="ident">suffixes</span>, <span class="string">&quot;ab+&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat13</span>, <span class="ident">suffixes</span>, <span class="string">&quot;ab+c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;bc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat14</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a^&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat15</span>, <span class="ident">suffixes</span>, <span class="string">&quot;$a&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;a&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat16</span>, <span class="ident">suffixes</span>, <span class="string">r&quot;ab*c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;bc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;ac&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat17</span>, <span class="ident">suffixes</span>, <span class="string">r&quot;ab+c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;bc&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat18</span>, <span class="ident">suffixes</span>, <span class="string">r&quot;z*azb&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;zazb&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;azb&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_cat19</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a.z&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;z&quot;</span>));

    <span class="comment">// Test regexes with alternations.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_alt1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a|b&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_alt2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;[1-3]|b&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;1&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;2&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;3&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_alt3</span>, <span class="ident">suffixes</span>, <span class="string">&quot;y(?:a|b)z&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;yaz&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;ybz&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_alt4</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a|b*&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_alt5</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a|b+&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_alt6</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a|(?:b|c*)&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_alt7</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(a|b)*c|(a|ab)*c&quot;</span>,
              <span class="ident">C</span>(<span class="string">&quot;ac&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;bc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;ac&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;abc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>));
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_alt8</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a*b|c&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>));

    <span class="comment">// Test regexes with empty assertions.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_empty1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a$&quot;</span>, <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>));

    <span class="comment">// Make sure some curious regexes have no suffixes.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_nothing1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;.&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_nothing2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?s).&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_nothing3</span>, <span class="ident">suffixes</span>, <span class="string">&quot;^&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_nothing4</span>, <span class="ident">suffixes</span>, <span class="string">&quot;$&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_nothing6</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?m)$&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_nothing7</span>, <span class="ident">suffixes</span>, <span class="string">r&quot;\b&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_nothing8</span>, <span class="ident">suffixes</span>, <span class="string">r&quot;\B&quot;</span>);

    <span class="comment">// Test a few regexes that defeat any suffix literal detection.</span>
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a.&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?s)a.&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated3</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a*b*c*&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated4</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a|.&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated5</span>, <span class="ident">suffixes</span>, <span class="string">&quot;.|a&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated6</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a|^&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated7</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?:a(?:b)(?:c)).&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated8</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a^&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated9</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?m)a$&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated10</span>, <span class="ident">suffixes</span>, <span class="string">r&quot;a\b&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated11</span>, <span class="ident">suffixes</span>, <span class="string">r&quot;a\B&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated12</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a^*&quot;</span>);
    <span class="macro">test_lit</span><span class="macro">!</span>(<span class="ident">sfx_defeated13</span>, <span class="ident">suffixes</span>, <span class="string">&quot;a^+&quot;</span>);

    <span class="comment">// These test use a much lower limit than the default so that we can</span>
    <span class="comment">// write test cases of reasonable size.</span>
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">sfx_exhausted1</span>, <span class="ident">suffixes</span>, <span class="string">&quot;[a-z]&quot;</span>);
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">sfx_exhausted2</span>, <span class="ident">suffixes</span>, <span class="string">&quot;A[a-z]*&quot;</span>);
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">sfx_exhausted3</span>, <span class="ident">suffixes</span>, <span class="string">&quot;A[a-z]Z&quot;</span>, <span class="ident">C</span>(<span class="string">&quot;Z&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">sfx_exhausted4</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?i)foobar&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;AR&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;Ar&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;aR&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;ar&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">sfx_exhausted5</span>, <span class="ident">suffixes</span>, <span class="string">&quot;(?:ab){100}&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;abababababababababab&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">sfx_exhausted6</span>, <span class="ident">suffixes</span>, <span class="string">&quot;cd(?:(?:ab){100})*&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;ababababab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;cd&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">sfx_exhausted7</span>, <span class="ident">suffixes</span>, <span class="string">&quot;cd(?:(?:ab){100})*z&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;abababababz&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;cdz&quot;</span>));
    <span class="macro">test_exhausted</span><span class="macro">!</span>(<span class="ident">sfx_exhausted8</span>, <span class="ident">suffixes</span>, <span class="string">&quot;zaaaaaaaaaaaaaaaaaaaa&quot;</span>,
                    <span class="ident">C</span>(<span class="string">&quot;aaaaaaaaaaaaaaaaaaaa&quot;</span>));

    <span class="comment">// ************************************************************************</span>
    <span class="comment">// Tests for generating unambiguous literal sets.</span>
    <span class="comment">// ************************************************************************</span>

    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_unamb</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">given</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            <span class="attribute">#[<span class="ident">test</span>]</span>
            <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>() {
                <span class="kw">let</span> <span class="ident">given</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Lit</span><span class="op">&gt;</span> <span class="op">=</span>
                    <span class="macro-nonterminal">$</span><span class="macro-nonterminal">given</span>
                    .<span class="ident">into_iter</span>()
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">ul</span><span class="op">|</span> {
                        <span class="kw">let</span> <span class="ident">cut</span> <span class="op">=</span> <span class="ident">ul</span>.<span class="ident">is_cut</span>();
                        <span class="ident">Lit</span> { <span class="ident">v</span>: <span class="ident">ul</span>.<span class="ident">v</span>.<span class="ident">into_bytes</span>(), <span class="ident">cut</span>: <span class="ident">cut</span> }
                    })
                    .<span class="ident">collect</span>();
                <span class="kw">let</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">create_lits</span>(<span class="ident">given</span>);
                <span class="kw">let</span> <span class="ident">got</span> <span class="op">=</span> <span class="ident">lits</span>.<span class="ident">unambiguous_prefixes</span>();
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>, <span class="ident">escape_lits</span>(<span class="ident">got</span>.<span class="ident">literals</span>()));
            }
        };
    }

    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous1</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;z&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;azb&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;z&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous2</span>,
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;zaaaaaa&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;aa&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;aa&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;z&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous3</span>,
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;Sherlock&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Watson&quot;</span>)],
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;Sherlock&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Watson&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous4</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bc&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;bc&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous5</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;bc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;bc&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous6</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;aa&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous7</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;aa&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous8</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;ab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;a&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous9</span>,
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;ac&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;bc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;ac&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;c&quot;</span>)],
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;b&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;c&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous10</span>,
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;Mo&#39;&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Mu&#39;&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Mo&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;Mu&quot;</span>)],
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;Mo&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;Mu&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous11</span>,
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;zazb&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;azb&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;z&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous12</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;foo&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;foo&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;foo&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous13</span>,
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;ABCX&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;CDAX&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;BCX&quot;</span>)],
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;A&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;BCX&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;CD&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous14</span>,
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;IMGX&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;MVIX&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;MGX&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;DSX&quot;</span>)],
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;DSX&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;I&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;MGX&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;MV&quot;</span>)]);
    <span class="macro">test_unamb</span><span class="macro">!</span>(<span class="ident">unambiguous15</span>,
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;IMG_&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;MG_&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;CIMG&quot;</span>)],
                <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;C&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;I&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;MG_&quot;</span>)]);


    <span class="comment">// ************************************************************************</span>
    <span class="comment">// Tests for suffix trimming.</span>
    <span class="comment">// ************************************************************************</span>
    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_trim</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">trim</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">given</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            <span class="attribute">#[<span class="ident">test</span>]</span>
            <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>() {
                <span class="kw">let</span> <span class="ident">given</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Lit</span><span class="op">&gt;</span> <span class="op">=</span>
                    <span class="macro-nonterminal">$</span><span class="macro-nonterminal">given</span>
                    .<span class="ident">into_iter</span>()
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">ul</span><span class="op">|</span> {
                        <span class="kw">let</span> <span class="ident">cut</span> <span class="op">=</span> <span class="ident">ul</span>.<span class="ident">is_cut</span>();
                        <span class="ident">Lit</span> { <span class="ident">v</span>: <span class="ident">ul</span>.<span class="ident">v</span>.<span class="ident">into_bytes</span>(), <span class="ident">cut</span>: <span class="ident">cut</span> }
                    })
                    .<span class="ident">collect</span>();
                <span class="kw">let</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">create_lits</span>(<span class="ident">given</span>);
                <span class="kw">let</span> <span class="ident">got</span> <span class="op">=</span> <span class="ident">lits</span>.<span class="ident">trim_suffix</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">trim</span>).<span class="ident">unwrap</span>();
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>, <span class="ident">escape_lits</span>(<span class="ident">got</span>.<span class="ident">literals</span>()));
            }
        }
    }

    <span class="macro">test_trim</span><span class="macro">!</span>(<span class="ident">trim1</span>, <span class="number">1</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;ab&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;yz&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;y&quot;</span>)]);
    <span class="macro">test_trim</span><span class="macro">!</span>(<span class="ident">trim2</span>, <span class="number">1</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;abd&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;ab&quot;</span>)]);
    <span class="macro">test_trim</span><span class="macro">!</span>(<span class="ident">trim3</span>, <span class="number">2</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;abd&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>)]);
    <span class="macro">test_trim</span><span class="macro">!</span>(<span class="ident">trim4</span>, <span class="number">2</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">M</span>(<span class="string">&quot;abc&quot;</span>), <span class="ident">M</span>(<span class="string">&quot;ghij&quot;</span>)], <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">C</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">C</span>(<span class="string">&quot;gh&quot;</span>)]);

    <span class="comment">// ************************************************************************</span>
    <span class="comment">// Tests for longest common prefix.</span>
    <span class="comment">// ************************************************************************</span>

    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_lcp</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">given</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            <span class="attribute">#[<span class="ident">test</span>]</span>
            <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>() {
                <span class="kw">let</span> <span class="ident">given</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Lit</span><span class="op">&gt;</span> <span class="op">=</span>
                    <span class="macro-nonterminal">$</span><span class="macro-nonterminal">given</span>
                    .<span class="ident">into_iter</span>()
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">|</span> <span class="ident">Lit</span> {
                        <span class="ident">v</span>: <span class="ident">s</span>.<span class="ident">to_owned</span>().<span class="ident">into_bytes</span>(),
                        <span class="ident">cut</span>: <span class="bool-val">false</span>,
                    })
                    .<span class="ident">collect</span>();
                <span class="kw">let</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">create_lits</span>(<span class="ident">given</span>);
                <span class="kw">let</span> <span class="ident">got</span> <span class="op">=</span> <span class="ident">lits</span>.<span class="ident">longest_common_prefix</span>();
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>, <span class="ident">escape_bytes</span>(<span class="ident">got</span>));
            }
        };
    }

    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp1</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;a&quot;</span>], <span class="string">&quot;a&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp2</span>, <span class="macro">vec</span><span class="macro">!</span>[], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp3</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;a&quot;</span>, <span class="string">&quot;b&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp4</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;ab&quot;</span>, <span class="string">&quot;ab&quot;</span>], <span class="string">&quot;ab&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp5</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;ab&quot;</span>, <span class="string">&quot;a&quot;</span>], <span class="string">&quot;a&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp6</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;a&quot;</span>, <span class="string">&quot;ab&quot;</span>], <span class="string">&quot;a&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp7</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;ab&quot;</span>, <span class="string">&quot;b&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp8</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;b&quot;</span>, <span class="string">&quot;ab&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp9</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;foobar&quot;</span>, <span class="string">&quot;foobaz&quot;</span>], <span class="string">&quot;fooba&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp10</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;foobar&quot;</span>, <span class="string">&quot;foobaz&quot;</span>, <span class="string">&quot;a&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp11</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;a&quot;</span>, <span class="string">&quot;foobar&quot;</span>, <span class="string">&quot;foobaz&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcp</span><span class="macro">!</span>(<span class="ident">lcp12</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;foo&quot;</span>, <span class="string">&quot;flub&quot;</span>, <span class="string">&quot;flab&quot;</span>, <span class="string">&quot;floo&quot;</span>], <span class="string">&quot;f&quot;</span>);

    <span class="comment">// ************************************************************************</span>
    <span class="comment">// Tests for longest common suffix.</span>
    <span class="comment">// ************************************************************************</span>

    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_lcs</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">given</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            <span class="attribute">#[<span class="ident">test</span>]</span>
            <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>() {
                <span class="kw">let</span> <span class="ident">given</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Lit</span><span class="op">&gt;</span> <span class="op">=</span>
                    <span class="macro-nonterminal">$</span><span class="macro-nonterminal">given</span>
                    .<span class="ident">into_iter</span>()
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">|</span> <span class="ident">Lit</span> {
                        <span class="ident">v</span>: <span class="ident">s</span>.<span class="ident">to_owned</span>().<span class="ident">into_bytes</span>(),
                        <span class="ident">cut</span>: <span class="bool-val">false</span>,
                    })
                    .<span class="ident">collect</span>();
                <span class="kw">let</span> <span class="ident">lits</span> <span class="op">=</span> <span class="ident">create_lits</span>(<span class="ident">given</span>);
                <span class="kw">let</span> <span class="ident">got</span> <span class="op">=</span> <span class="ident">lits</span>.<span class="ident">longest_common_suffix</span>();
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>, <span class="ident">escape_bytes</span>(<span class="ident">got</span>));
            }
        };
    }

    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs1</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;a&quot;</span>], <span class="string">&quot;a&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs2</span>, <span class="macro">vec</span><span class="macro">!</span>[], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs3</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;a&quot;</span>, <span class="string">&quot;b&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs4</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;ab&quot;</span>, <span class="string">&quot;ab&quot;</span>], <span class="string">&quot;ab&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs5</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;ab&quot;</span>, <span class="string">&quot;a&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs6</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;a&quot;</span>, <span class="string">&quot;ab&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs7</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;ab&quot;</span>, <span class="string">&quot;b&quot;</span>], <span class="string">&quot;b&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs8</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;b&quot;</span>, <span class="string">&quot;ab&quot;</span>], <span class="string">&quot;b&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs9</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;barfoo&quot;</span>, <span class="string">&quot;bazfoo&quot;</span>], <span class="string">&quot;foo&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs10</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;barfoo&quot;</span>, <span class="string">&quot;bazfoo&quot;</span>, <span class="string">&quot;a&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs11</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;a&quot;</span>, <span class="string">&quot;barfoo&quot;</span>, <span class="string">&quot;bazfoo&quot;</span>], <span class="string">&quot;&quot;</span>);
    <span class="macro">test_lcs</span><span class="macro">!</span>(<span class="ident">lcs12</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;flub&quot;</span>, <span class="string">&quot;bub&quot;</span>, <span class="string">&quot;boob&quot;</span>, <span class="string">&quot;dub&quot;</span>], <span class="string">&quot;b&quot;</span>);
}
</pre>
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                    <dd>Move up in search results</dd>
                    <dt>&rarrb;</dt>
                    <dd>Move down in search results</dd>
                    <dt>&#9166;</dt>
                    <dd>Go to active search result</dd>
                    <dt>+</dt>
                    <dd>Collapse/expand all sections</dd>
                </dl>
            </div>

            <div class="infos">
                <h2>Search Tricks</h2>

                <p>
                    Prefix searches with a type followed by a colon (e.g.
                    <code>fn:</code>) to restrict the search to a given type.
                </p>

                <p>
                    Accepted types are: <code>fn</code>, <code>mod</code>,
                    <code>struct</code>, <code>enum</code>,
                    <code>trait</code>, <code>type</code>, <code>macro</code>,
                    and <code>const</code>.
                </p>

                <p>
                    Search functions by type signature (e.g.
                    <code>vec -> usize</code> or <code>* -> vec</code>)
                </p>
            </div>
        </div>
    </aside>

    

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